1
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A moving coil galvanometer is converted into an ammeter, reading upto $$0.04 \mathrm{~A}$$ by connecting a shunt of resistance '$$3 \mathrm{r}$$' across it and then into an ammeter reading upto $$0.8 \mathrm{~A}$$, when a shunt of resistance '$$r$$' is connected across it. What is the maximum current which can be sent through this galvanometer if no shunt is used?

A
$$0.02 \mathrm{~A}$$
B
$$0.04 \mathrm{~A}$$
C
$$0.08 \mathrm{~A}$$
D
$$0.01 \mathrm{~A}$$
2
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The inductive reactance of a coil is R$$\Omega$$. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new inductive reactance will be

A
2R
B
8R
C
$$\mathrm{\frac{R}{2}}$$
D
4R
3
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

For a body of mass '$$m$$', the acceleration due to gravity at a distance '$$R$$' from the surface of the earth is $$\left(\frac{g}{4}\right)$$. Its value at a distance $$\left(\frac{R}{2}\right)$$ from the surface of the earth is ( $$R=$$ radius of the earth, $$g=$$ acceleration due to gravity)

A
$$\left(\frac{g}{8}\right)$$
B
$$\left(\frac{9 g}{4}\right)$$
C
$$\left(\frac{4 g}{9}\right)$$
D
$$\left(\frac{\mathrm{g}}{2}\right)$$
4
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

What is the ratio of the velocity of sound in hydrogen $$\left(\gamma=\frac{7}{5}\right)$$ to that in helium $$\left(\gamma=\frac{5}{3}\right)$$ at the same temperature? (Molecular weight of hydrogen and helium is 2 and 4 respectively.)

A
$$\frac{\sqrt{42}}{5}$$
B
$$\frac{5}{\sqrt{42}}$$
C
$$\frac{\sqrt{21}}{5}$$
D
$$\frac{5}{\sqrt{21}}$$
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